purge cache when the figure files are missing for some reason #588
bootstrap.css has moved
news for SublimeKnitr; closes #449
#588 when cache=2, I still need to preserve information about plots; instead of raw info, I save md5 digests
params is a list, so c() also works and the result will still be a list
rename cache2.opts to cache1.opts because cache2.opts will be more than that #587
more options affecting cache=2 #587
closes #590: a new function filter_evaluate() to filter out some results from evaluate(), and warning/message can be numeric indices now
bump version